Impingement cooling of gas turbine blades or vanes

Abstract

A turbine blade or vane comprises an impingement tube located generally in a radial direction within the blade or vane aerofoil, the impingement tube comprising two parts, extending into the blade or vane from opposite radial ends thereof and locating against a specially formed rib which extends generally chordwise around the leading edge of the aerofoil.

1. A turbine component, comprising:
 a hollow aerofoil; 
 a chordwise extending rib arranged on the interior surface of the hollow aerofoil; 
 a first impingement tube portion; and 
 a second impingement tube portion, 
 wherein, 
 the first impingement tube portion and the second impingement tube portion extend spanwise through the aerofoil and have confronting ends near the rib, 
 the rib has a chevron-shaped cross-section thereby to engage the confronting ends of the first and second impingement tube portions and the confronting ends of the impingement tube portions are bevelled in a complementary way to the chevron-shaped rib. 
 
   
   
     2. The turbine component according to  claim 1 , wherein the turbine component is a blade or vane. 
   
   
     3. The turbine component according to  claim 1 , wherein a plurality of chordwise extending ribs are arranged near the interior surface of the hollow aerofoil and are provided in addition to the rib that locates the confronting ends of the first and second impingement tube portions. 
   
   
     4. The turbine component according to  claim 1 , wherein the rib that locates the confronting ends of the first and second impingement tube portions is discontinuous. 
   
   
     5. The turbine component according to  claim 1 , wherein at least one of the confronting ends of the first and second impingement tube portions has an end wall there-across. 
   
   
     6. The turbine component according to  claim 5 , wherein apertures are provided in or adjacent to the or each end wall allowing cooling air to exit the apertures between the first impingement tube portion and second impingement tube portion and impinge on the inner surface of a blade or vane near the mid-height region thereof.